/*
 * Copyright 2024 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.pajamas.starter.integration.spring.event.blocking;

import com.google.common.collect.Sets;

import org.apache.commons.collections4.CollectionUtils;
import org.pajamas.protocol.EventHandler;
import org.springframework.context.event.EventListener;

import java.util.Collection;
import java.util.EventObject;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * @author william
 * @since 2024/1/1
 */

public class BlockingEventListener {
    private final transient Set<EventHandler> handlers;

    public BlockingEventListener(Collection<EventHandler> handlers) {
        this.handlers = Sets.newHashSet();
        Set<EventHandler> handlerSet = handlers.stream().filter(Objects::nonNull).collect(Collectors.toSet());
        if (CollectionUtils.isNotEmpty(handlerSet)) {
            this.handlers.addAll(handlerSet);
        }
    }

    @EventListener
    public void dispatch(EventObject event) {
        if (CollectionUtils.isNotEmpty(this.handlers)) {
            this.handlers.forEach(handler -> handler.tryHandle(event));
        }
    }
}
